Hans von Pechmann

1.4.1850   19.4.1902

in Tübingen 1895-1902



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Hans von Pechmann (1850 - 1902) was a German chemist, renowned for his discovery of diazomethane, Pechmann condensation and Pechmann pyrazole synthesis. He also first prepared 1,2-diketones (e.g., diacetyl), acetonedicarboxylic acid, methylglyoxal and diphenyltriketone; established the symmetrical structure of anthraquinone.

Von Pechmann also discovered polyethylene plastics serendipitously, when accidentally heating diazomethane.

After studying with Heinrich Limpricht at the University of Greifswald he became Professor at the University of Munich till 1895. He was professor at the University of Tübingen from 1895 till his death in 1902.


H. v. Pechmann (1894). "Ueber Diazomethan". Berichte der deutschen chemischen Gesellschaft 27 (2): 1888–1891

Pechmann Condensation


H. v. Pechmann, C. Duisberg, Ber. 16, 2119 (1883)

Pechmann Pyrazole Synthesis


H. v. Pechmann, Ber. 31, 2950 (1898)